Add support for Swedish

* Add support and tests for CompanySE
* Add support and tests for InternetSE
* Add support and tests for PhoneNumberSE
* Add support and tests for AddressSE
* Add support and tests for NameSE
* Add new module and tests for Social Security Number (SSN and SSNSE)
* Update gemspec with new Swedish modules

(mostly used the Danish stuff as templates)